CERN Accelerating science

Accelerator Physics

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2023-01-24
15:51
Study of the TT2/TT10 transfer line optics via transfer matrix measurement / Arduini, G ; Giovannozzi, M ; Hanke, K ; Hemery, J Y
CERN-PS-CA-Note-98-20-MD; CERN-SL-OP-Note-98-58-MD; PS-CA-Note-98-20-MD; SL-OP-Note-98-58-MD.- Geneva : CERN, 1998 - 13 p. Fulltext: PDF;

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2023-01-24
15:51
Measurements of coupled Landau damping of the PS coherent resistive instability / Métral, E
CERN-PS-CA-Note-98-16; PS-CA-Note-98-16.- Geneva : CERN, 1998 - 9 p. Fulltext: PDF;

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2023-01-17
06:01
Design of beam optics for RF-separated kaon and antiproton beams in the M2 beam line of the CERN North Area / Gerbershagen, A (CERN ; Groningen, KVI) ; Andrieux, V (Illinois U., Urbana (main)) ; Bernhard, J (CERN) ; Brugger, M (CERN) ; Denisov, O (ASI, Rome ; INFN, Italy) ; Friedrich, J (Munich, Tech. U.) ; Gatignon, L (Lancaster U.) ; Gerigk, F (CERN) ; Guskov, A (Dubna, JINR) ; Ketzer, B (Bonn U.) et al.
The present contribution reviews the principle of RF separation and explains its dependence on different parameters of beam optics and hardware. The first examination of potential showstoppers for the RF-separated beam implementation for Phase-2 of the AMBER experiment in the M2 beam line of the North Area is presented. [...]
2023 - 12 p. - Published in : Nucl. Instrum. Methods Phys. Res., A 1048 (2023) 168004 Fulltext: PDF;

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2023-01-14
06:10
Camera Placement in a Short Working Distance Optical Inspection System for RF Cavities / Macpherson, Alick (CERN) ; Buonocore, Luca Rosario (CERN) ; Di Castro, Mario (CERN) ; Gamper, Hannes (CERN ; Linz U.) ; Luthi, Adrien (CERN)
Inspection of the RF surface of cavities for the purpose of detecting surface anomalies has been well established, and is typically based on long working distance optical systems using on-axis camera and mirror systems to scan the cavity surface. In order to improve the systematic inspection of the full RF surface of large area cavities, a novel short working distance inspection system is being developed at CERN. [...]
2022 - 5 p. - Published in : JACoW SRF 2021 (2022) 503-507 Fulltext: PDF;
In : 20th International Conference on RF Superconductivity (SRF 2021), Online, US, 28 Jun - 2 Jul 2021, pp.503-507

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2023-01-11
06:09
First Interaction Region Local Coupling Corrections in the LHC Run 3 / Soubelet, Felix (CERN ; Liverpool U.) ; Apsimon, Oznur (Liverpool U.) ; Persson, Tobias (CERN) ; Tomás García, Rogelio (CERN) ; Welsch, Carsten (Liverpool U.)
The successful operation of large scale particle accelerators depends on the precise correction of unavoidable magnetic field or magnet alignment errors present in the machine. During the LHC Run 2, local linear coupling in the interaction regions (IR) was shown to have a significant impact on the beam size, making its proper handling a necessity for Run 3 and the High Luminosity LHC (HL-LHC). [...]
2022 - 4 p. - Published in : JACoW IPAC 2022 (2022) 1838-1841 Fulltext: PDF;
In : 13th International Particle Accelerator Conference (IPAC 2022), Bangkok, Thailand, 12 - 17 Jun 2022, pp.1838-1841

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2023-01-11
06:09
Reconstruction of Transverse Phase Space From Transverse Feedback Data for Real Time Extraction of Vital LHC Machine Parameters / Kotzian, Gerd (CERN) ; Soderen, Martin (CERN) ; Solvang, Preben (CERN) ; Stopjakova, Viera (Bratislava, Inst. Phys.) ; Valuch, Daniel (CERN)
The LHC transverse feedback system (ADT) provides bunch by bunch, turn by turn, normalized and digitized beam position signals from four pick-ups per plane and for each beam. Together with already existing powerful computer-based observation systems, this data can be used to reconstruct in real-time the transverse phase space coordinates of the centre-of-charges, for each individual bunch. [...]
2022 - 4 p. - Published in : JACoW IPAC 2022 (2022) 937-940 Fulltext: PDF;
In : 13th International Particle Accelerator Conference (IPAC 2022), Bangkok, Thailand, 12 - 17 Jun 2022, pp.937-940

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2023-01-11
06:09
Impact of Broadband Impedance on Longitudinal Coupled-Bunch Instability Threshold / Karpov, Ivan (CERN) ; Shaposhnikova, Elena (CERN)
Coupled-bunch instabilities (CBI) and the loss of Landau damping (LLD) in the longitudinal plane can affect the performance of high-current synchrotrons. The former is driven by the narrowband impedance of resonant structures, while the latter is mainly determined by the broadband impedance of the entire accelerator and is a single-bunch effect. [...]
2022 - 4 p. - Published in : JACoW IPAC 2022 (2022) 2245-2248 Fulltext: PDF;
In : 13th International Particle Accelerator Conference (IPAC 2022), Bangkok, Thailand, 12 - 17 Jun 2022, pp.2245-2248

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2023-01-11
06:09
Thermo-Mechanical Modeling and Thermal Performance Analysis of Beam Vacuum Line Interconnections and Cold Warm Transitions in HL-LHC Long Straight Section Magnets / Harray, Jérôme (CERN) ; Garion, Cedric (CERN) ; Petit, Valentine (CERN)
The HL-LHC upgrade, aiming at increasing the LHC levelled luminosity by factor of five, relies on new superconducting magnets requiring a new beam vacuum system. Along with the challenges related to magnet design, the beam optic configuration exposes this new equipment to stringent conditions for vacuum and cryogenic performance. [...]
2022 - 4 p. - Published in : JACoW IPAC 2022 (2022) 2839-2842 Fulltext: PDF;
In : 13th International Particle Accelerator Conference (IPAC 2022), Bangkok, Thailand, 12 - 17 Jun 2022, pp.2839-2842

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2023-01-11
06:09
Design of a Collimation Section for the FCC-ee / Hofer, Michael (CERN) ; Abramov, Andrey (CERN) ; Bruce, Roderik (CERN) ; Moudgalya, Maitreyee (Ecole Polytechnique, Lausanne) ; Oide, Katsunobu (CERN) ; Pieloni, Tatiana (Ecole Polytechnique, Lausanne) ; Zimmermann, Frank (CERN)
The design parameters of the FCC-ee foresee operation with a total stored beam energy of about 20 MJ, exceeding those of previous lepton colliders by almost two orders of magnitude. Given the inherent damage potential, a halo collimation system is studied to protect the machine hardware, in particular superconducting equipment such as the final focus quadrupoles, from sudden beam loss. [...]
2022 - 4 p. - Published in : JACoW IPAC 2022 (2022) 1722-1725 Fulltext: PDF;
In : 13th International Particle Accelerator Conference (IPAC 2022), Bangkok, Thailand, 12 - 17 Jun 2022, pp.1722-1725

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2023-01-11
06:09
Prospects to Apply Machine Learning to Optimize the Operation of the Crystal Collimation System at the LHC / D'Andrea, Marco (CERN) ; Azzopardi, Gabriella (CERN) ; Di Castro, Mario (CERN) ; Matheson, Eloise (CERN) ; Mirarchi, Daniele (CERN) ; Redaelli, Stefano (CERN) ; Ricci, Gianmarco (CERN ; U. Rome La Sapienza (main)) ; Valentino, Gianluca (CERN ; Malta U.)
Crystal collimation relies on the use of bent crystals to coherently deflect halo particles onto dedicated collimator absorbers. This scheme is planned to be used at the LHC to improve the betatron cleaning efficiency with high-intensity ion beams. [...]
2022 - 4 p. - Published in : JACoW IPAC 2022 (2022) 1362-1365 Fulltext: PDF;
In : 13th International Particle Accelerator Conference (IPAC 2022), Bangkok, Thailand, 12 - 17 Jun 2022, pp.1362-1365

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